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Message - Re: clipping problem in the lights and textures window

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Posted by  Mike Wheeler on August 21, 2001 at 10:34:39:

In Reply to:  Re: clipping problem in the lights and textures window posted by Santiago Molina on August 20, 2001 at 20:13:32:

Dear Santiago,

What you are seeing here are Z buffer sorting errors. This is something done in QuickDraw 3D which DesignWorkshop has virtually no control over.

QuickDraw 3D draw the farthest geometry first and then the next closest geometry and so on until it gets to the geometry closest to your eye point. This is how the closer things appear in front of the farther things.

If you have objects very close to each other in a very large space there may be sorting problems. In your case there are objects within 40 centimeters of each other in a view that is measured in kilometers.

Z buffer sorting errors are especially noticable on Macintosh computers using ATI hardware accellerated rendering. ATI hardware supports a 16 bit Z buffer. Apple software rendering supports a 32 bit Z buffer. I am not positive, but I believe the LightWorks renderers also support a 32 bit Z buffer. The more bits in the Z buffer the more likely the rendering will be drawn correctly.

If you are using an ATI hardware accellerator for rendering you should swith to Apple Software with the View menu, Rendering > Graphics Engine > Apple Software command.

If that doesn't help, your best bet may be to lower the block that makes all the streets for very distant views like this. This would increase the distance between that block and the objects on top of it and reduce the chance of Z buffer errors.

By the way, this model looks great!

Please let us know if you have any further questions.

Best wishes,

Mike Wheeler
support@artifice.com

 


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